main.css update

switched from

<ul>
<li class="subNavFirst"><a href="#">Security for Home</a></li>
<li><a href="#">Security for Business</a></li>
</ul>

to

<ul class="subNav">
<li><a href="#">Security for Home</a></li>
<li><a href="#">Security for Business</a></li>
</ul>

and then get the first element by css (:first-child is recognized by
>=IE7)

.subNav>li:first-child
Merge pull request #4 from lucatrincauk/Luca

main.css update